CVE-2021-29240

Pilz PMC programming tool 3.x.x — vulnerability CVE-2021-29240

The Package Manager of CODESYS Development System 3 before 3.5.17.0 does not check the validity of packages before installation and may be used to install CODESYS packages with malicious content.

CVSS 7.8No patch available

This record: live connection— last retrieved: 7 November 2026 at 02:05.

Vendors

Pilz, Festo

Products

PMC programming tool 3.x.x, CODESYS Development System, Automation Suite

up to version 3.0.0<=3.5.15

Published

4 May 2021

Last modified

17 June 2026

Original source information

Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.

Technical description

The Package Manager of CODESYS Development System 3 before 3.5.17.0 does not check the validity of packages before installation and may be used to install CODESYS packages with malicious content.

CVSS 3.1 — vector details

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack vector

LOCAL

Privileges required

NONE

User interaction

REQUIRED

Confidentiality

High

Integrity

High

Availability

High

EPSS — Exploit Prediction Scoring System

Probability of exploitation within 30 days

0.9%

Percentile

61e

Source: FIRST.org, updated on 6 November 2026.

Patch information

Use a hardware firewall, host-based firewall or comparable measures at network level toprotect against unauthorised network communication with the PC. Use a virus scanner or other measures to protect against malware. Only use CODESYS libraries and archives from trusted sources.

IACS Radar assessment

Our own interpretation and context for the source data above.

IACS Radar assessment

Our own interpretation and context for this vulnerability — not an official source.

IACS Radar priority score

42/ 100

Based on CVSS 7.8, EPSS 0.9%, industrial relevance 40/100.

Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.

Conditions for exploitation

•Local or adjacent access to the device is required.
•No valid credentials are needed.
•User interaction (for example opening a file) is required.

Operational impact & energy relevance

Possible loss of visibility of or control over the process upon successful exploitation.

No strong energy-sector-specific signals recognised; general OT/ICS relevance.

Recommended defensive measures

•Apply the latest firmware or software update and validate its integrity.
•Restrict network access to the affected device to a dedicated OT management segment.
•Implement network segmentation in line with zones and conduits (IEC 62443-3-2).
•Monitor for abnormal protocol traffic using an OT-aware detection system.

Industrial relevance score

40/ 100

• Mentioned in an official CISA ICS advisory, which confirms direct relevance to industrial control systems.

Classification is provisional; manual verification by an OT security analyst is recommended.

Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.

IEC 62443 mapping

IEC 62443-4-1FR3 · Systeemintegriteit

Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.

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